Answer: Akashi - Kaikyo Bridge would be 13000 feet long.
Explanation:
Since we have given that
Length of the Golden Gate Bridge = 9000 feet
According to question, The Akashi-Kaikyo bridge in Japan is about 1 4/9 as long as the Golden Gate Bridge in San Francisco.
So, Length of Akashi- Kaikyo bridge would be

Hence, Akashi - Kaikyo Bridge would be 13000 feet long.